Middle school students are encouraged to participate in co-curricular activities offered at CAJ. Students can participate in one sport per season. Sports offered are:
- Boys-Soccer, Cross Country
- Girls-Soccer, Cross Country, Volleyball
- Boys-Wrestling, Basketball
- Girls-Basketball, Track
The above full season sports have a ¥5000 participation fee that is billed to the family account.
Other co-curricular activities that are offered are: drama, tennis club, and brain bowl.
Handbells and robotics are offered by season (Fall, Winter, Spring) and have the same ¥5000 participation fee as sports.